Uncle Sam standing on US ships in the Black Sea, looks through a spyglass on USSR with a sign “Provocation” on it.  Uncle Sam was widely used to represent USA.

Another image of the USA as war mongers.

“Youth Exposes Imperialism”

This poster was highly visible, posted throughout the USSR.  While the caption doesn't translate well it is accusing the US of being imperialists and the dangers to the youth that are associated.